Taghipour Fariborz
Trojan Technologies Inc., Canada.
Water Res. 2004 Nov;38(18):3940-8. doi: 10.1016/j.watres.2004.06.016.
The impacts of UV irradiation, gamma irradiation, and a combination of both on Escherichia coli inactivation in primary and secondary wastewater effluents were investigated. UV doses of 35 and 62 J/m(2) were required for a 1-log inactivation of E. coli in the primary and secondary wastewater samples, respectively. A gamma dose of 170 Gy (J/kg) was required for a 1-log inactivation of E. coli in both wastewater samples. Variation in gamma radiation dose rates did not have a significant impact on the extent of inactivation at a given total dose. Gamma irradiation of previously UV-irradiated samples indicated that particle-associated microorganisms, which are protected from UV, can be inactivated by ionizing radiation at a rate similar to that for free microorganism inactivation. An estimation of the energy required for disinfection indicated that, in general, the required energy and the energy cost for E. coli inactivation using ionizing radiation are considerably higher than those for UV radiation.
研究了紫外线照射、伽马射线照射以及二者联合作用对一级和二级废水流出物中大肠杆菌灭活的影响。在一级和二级废水样本中，分别需要35和62 J/m(2)的紫外线剂量才能使大肠杆菌实现1个对数级的灭活。在两种废水样本中，使大肠杆菌实现1个对数级的灭活均需要170 Gy（J/kg）的伽马射线剂量。在给定的总剂量下，伽马射线剂量率的变化对灭活程度没有显著影响。对先前经紫外线照射的样本进行伽马射线照射表明，受紫外线保护的与颗粒相关的微生物可被电离辐射灭活，其灭活速率与游离微生物的灭活速率相似。对消毒所需能量的估算表明，一般而言，使用电离辐射灭活大肠杆菌所需的能量和能源成本远高于紫外线辐射。
